Patents by Inventor Stephan Schlitter
Stephan Schlitter has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11498997Abstract: Process for the removal of volatile compounds from a tackifier comprising a resin with repeating units of formula I wherein R1 is a linear or branched alkylen group with 1 to 10 carbon atoms and R2 is a linear or branched, saturated or unsaturated N aliphatic hydrocarbon group with up to 20 carbon atoms, and optionally a plasticizer, wherein the tackifier is passed through at least one evaporator as film and the volatile compounds are removed from the film.Type: GrantFiled: January 23, 2019Date of Patent: November 15, 2022Assignee: BASF SEInventors: Miran Yu, Ortmund Lang, Dieter Rodewald, Stephan Schlitter, Guenter Scherr, Felix Alexander Westerhaus
-
Patent number: 11248118Abstract: A tackifier comprising a resin with repeating units of formula (I) wherein R1 is a linear or branched alkylen group with 1 to 10 carbon atoms and R2 is a linear or branched, saturated or unsaturated aliphatic hydrocarbon group with up to 20 carbon atoms and a non-aromatic compound which consists to at least 50% by weight of one or more linear or branched, saturated or unsaturated aliphatic hydrocarbon groups with at least 4 carbon atoms.Type: GrantFiled: November 30, 2017Date of Patent: February 15, 2022Assignee: BASF SEInventors: Felix Alexander Westerhaus, Frank Reuter, Dieter Rodewald, Olivier Fleischel, Stephan Schlitter, Martin Voelkert, Fritz Nimtz, Ulrich Abel, Guenter Scherr
-
Publication number: 20210079150Abstract: Process for the removal of volatile compounds from a tackifier comprising a resin with repeating units of formula I wherein R1 is a linear or branched alkylen group with 1 to 10 carbon atoms and R2 is a linear or branched, saturated or unsaturated N aliphatic hydrocarbon group with up to 20 carbon atoms, and optionally a plasticizer, wherein the tackifier is passed through at least one evaporator as film and the volatile compounds are removed from the film.Type: ApplicationFiled: January 23, 2019Publication date: March 18, 2021Applicant: BASF SEInventors: Miran YU, Ortmund LANG, Dieter RODEWALD, Stephan SCHLITTER, Guenter SCHERR, Felix WESTERHAUS
-
Publication number: 20200255654Abstract: A tackifier comprising a resin with repeating units of formula (I) wherein R1 is a linear or branched alkylen group with 1 to 10 carbon atoms and R2 is a linear or branched, saturated or unsaturated aliphatic hydrocarbon group with up to 20 carbon atoms and a non-aromatic compound which consists to at least 50% by weight of one or more linear or branched, saturated or unsaturated aliphatic hydrocarbon groups with at least 4 carbon atoms.Type: ApplicationFiled: November 30, 2017Publication date: August 13, 2020Applicant: BASF SEInventors: Felix Alexander WESTERHAUS, Frank REUTER, Dieter RODEWALD, Olivier FLEISCHEL, Stephan SCHLITTER, Martin VOELKERT, Fritz NIMTZ, Ulrich ABEL, Guenter SCHERR
-
Patent number: 8933277Abstract: A process is provided for recovering components from a low boiler mixture which is obtained in the distillation of hydrogenation effluents from the preparation of polymethylols, by multistage distillation of the low boiler mixture having a tertiary amine, water, methanol, a polymethylol, a methylolalkanal, an alcohol and an alkanal with a methylene group in the alpha position to the carbonyl group. A first distillation stage involves separating the low boiler mixture into a higher-boiling, predominantly water-rich fraction and into a lower-boiling aqueous organic fraction having the tertiary amine. A second distillation stage involves separating the aqueous organic fraction from the first distillation stage into a predominantly amine-containing fraction and a further amine-depleted fraction. The tertiary amine is trimethylamine or triethylamine and the bottom temperature in the second distillation stage is at least 110° C.Type: GrantFiled: January 7, 2010Date of Patent: January 13, 2015Assignee: BASF SEInventors: Stephan Schlitter, Michael Steiniger, Stefan Rittinger, Tilman Sirch, Steffen Maas
-
Patent number: 8884076Abstract: The present invention relates to a process for distilling an aqueous polymethylol mixture which comprises a polymethylol of the formula (I) (HOCH2)2—C—R2??(I) in which each R is independently a further methylol group or an alkyl group having 1 to 22 carbon atoms or an aryl or aralkyl group having 6 to 22 carbon atoms, a tertiary amine, water and the adduct of tertiary amine and formic acid (amine formate), which comprises performing the distillation in a distillation column which is connected at the bottom to an evaporator, the bottom temperature being above the evaporation temperature of the monoester of formic acid and polymethylol (polymethylol formate) which forms during distillation. The present invention further relates to a composition comprising polymethylol and 1 to 10 000 ppm by weight of polymethylol formate, and to the use thereof.Type: GrantFiled: December 7, 2009Date of Patent: November 11, 2014Assignee: BASF SEInventors: Tilman Sirch, Michael Steiniger, Steffen Maas, Stefan Rittinger, Stephan Schlitter
-
Publication number: 20120004472Abstract: The present invention relates to a process for distilling an aqueous polymethylol mixture which comprises a polymethylol of the formula (I) (HOCH2)2—C—R2??(I) in which each R is independently a further methylol group or an alkyl group having 1 to 22 carbon atoms or an aryl or aralkyl group having 6 to 22 carbon atoms, a tertiary amine, water and the adduct of tertiary amine and formic acid (amine formate), which comprises performing the distillation in a distillation column which is connected at the bottom to an evaporator, the bottom temperature being above the evaporation temperature of the monoester of formic acid and polymethylol (polymethylol formate) which forms during distillation. The present invention further relates to a composition comprising polymethylol and 1 to 10 000 ppm by weight of polymethylol formate, and to the use thereof.Type: ApplicationFiled: December 7, 2009Publication date: January 5, 2012Applicant: BASF-SEInventors: Tilman Sirch, Michael Steiniger, Steffen Maas, Stefan Rittinger, Stephan Schlitter
-
Publication number: 20110272270Abstract: The present invention relates to a process for recovering components from a low boiler mixture which is obtained in the distillation of hydrogenation effluents from the preparation of polymethylols, by multistage distillation of the low boiler mixture comprising a tertiary amine, water, methanol, polymethylol of the formula (I) methylolalkanal of the formula (II) alcohol of the formula (III) and an alkanal with a methylene group in the ? position to the carbonyl group, and in which each R is independently a further methylol group or an alkyl group having 1 to 22 carbon atoms or an aryl or aralkyl group having 6 to 22 carbon atoms, a first distillation stage involving separating the low boiler mixture into a higher-boiling, predominantly water-rich fraction and into a lower-boiling aqueous organic fraction comprising the tertiary amine, and the second distillation stage involving separating the aqueous organic fraction from the first distillation stage into a predominantly amine-containing fractType: ApplicationFiled: January 7, 2010Publication date: November 10, 2011Applicant: BASF SEInventors: Stephan Schlitter, Michael Steiniger, Stefan Rittinger, Tilman Sirch, Steffen Maas
-
Patent number: 7884048Abstract: Carbon monoxide is removed from streams by adsorption on an adsorption composition which comprises copper, zinc and zirconium oxides and whose copper-comprising component has a degree of reduction, expressed as weight ratio of metallic copper to the sum of metallic copper and copper oxides, calculated as CuO, of at least 45% and not more than 75%.Type: GrantFiled: July 9, 2010Date of Patent: February 8, 2011Assignee: BASF SEInventors: Stephan Schlitter, Stephan Hatscher, Michael Hesse, Heiko Urtel
-
Publication number: 20100273640Abstract: Carbon monoxide is removed from streams by adsorption on an adsorption composition which comprises copper, zinc and zirconium oxides and whose copper-comprising component has a degree of reduction, expressed as weight ratio of metallic copper to the sum of metallic copper and copper oxides, calculated as CuO, of at least 45% and not more than 75%.Type: ApplicationFiled: July 9, 2010Publication date: October 28, 2010Applicant: BASF SEInventors: Stephan Schlitter, Stephan Hatscher, Michael Hesse, Heiko Urtel
-
Patent number: 7807603Abstract: The invention relates to a catalyst provided in the form of an extrudate, which contains 5 to 85% by weight of copper oxide and comprises, in the active material and as binders, the same oxidic carrier material. The invention also relates to the use of the catalyst for hydrogenating carbonyl compounds.Type: GrantFiled: December 4, 2004Date of Patent: October 5, 2010Assignee: BASF AktiengesellschaftInventors: Stephan Schlitter, Olga Schubert, Michael Hesse, Sabine Borchers, Markus Roesch, Rolf Pinkos, Alexander Weck, Gunther Windecker
-
Patent number: 7781368Abstract: Carbon monoxide is removed from streams by adsorption on an adsorption composition which comprises copper, zinc and zirconium oxides and whose copper-comprising component has a degree of reduction, expressed as weight ratio of metallic copper to the sum of metallic copper and copper oxides, calculated as CuO, of at least 45% and not more than 75%.Type: GrantFiled: February 7, 2007Date of Patent: August 24, 2010Assignee: BASF SEInventors: Stephan Schlitter, Stephan Hatscher, Michael Hesse, Heiko Urtel
-
Patent number: 7767865Abstract: The preparation of hydroxypivalaldehyde is effected by aldolizing isobutyraldehyde with formaldehyde and subsequently working up the resulting reaction effluent by distillation, wherein the reaction effluent is fed to a distillation column which is operated at a top pressure in the range from 0.5 to 1.5 bar and in which a two-stage condensation is provided in the top region, in which the vapors are first conducted into a partial condenser operated at a temperature in the range from 50 to 80° C., whose condensate is recycled at least partly into the distillation column, and in which the vapors uncondensed in the partial condenser are fed to a downstream condenser operated at a temperature in the range from ?40 to +30° C., whose condensate is at least partly discharged.Type: GrantFiled: February 25, 2008Date of Patent: August 3, 2010Assignee: BASF SEInventors: Tilman Sirch, Michael Steiniger, Steffen Maas, Stefan Rittinger, Stephan Schlitter
-
Publication number: 20100113836Abstract: The preparation of hydroxypivalaldehyde is effected by aldolizing isobutyraldehyde with formaldehyde and subsequently working up the resulting reaction effluent by distillation, wherein the reaction effluent is fed to a distillation column which is operated at a top pressure in the range from 0.5 to 1.5 bar and in which a two-stage condensation is provided in the top region, in which the vapors are first conducted into a partial condenser operated at a temperature in the range from 50 to 80° C., whose condensate is recycled at least partly into the distillation column, and in which the vapors uncondensed in the partial condenser are fed to a downstream condenser operated at a temperature in the range from ?40 to +30° C., whose condensate is at least partly discharged.Type: ApplicationFiled: February 25, 2008Publication date: May 6, 2010Inventors: Tilman Sirch, Michael Steiniger, Steffen Maas, Stefan Rittinger, Stephan Schlitter
-
Patent number: 7544766Abstract: The present invention relates to a process for preparing polytetrahydrofuran, polytetrahydrofuran copolymer, diester or monoester by polymerizing tetrahydrofuran in the presence of at least one telogen and/or comonomer and of an acidic heterogeneous catalyst based on activated sheet silicates or mixed metal oxides in a fluidized bed.Type: GrantFiled: December 23, 2003Date of Patent: June 9, 2009Assignee: BASF SEInventors: Stephan Schlitter, Martin Haubner, Peter Zehner, Michael Hesse, Alexander Weck, Rolf Pinkos, Thomas Graβler
-
Publication number: 20090098037Abstract: Carbon monoxide is removed from streams by adsorption on an adsorption composition which comprises copper, zinc and zirconium oxides and whose copper-comprising component has a degree of reduction, expressed as weight ratio of metallic copper to the sum of metallic copper and copper oxides, calculated as CuO, of at least 45% and not more than 75%.Type: ApplicationFiled: February 7, 2007Publication date: April 16, 2009Applicant: BASF SEInventors: Stephan Schlitter, Stephan Hatscher, Michael Hesse, Heiko Urtel
-
Publication number: 20090069604Abstract: A process for catalytically hydrogenating methylolalkanals of the general formula in which R1 and R2 are each independently a further methylol group or an alkyl group having from 1 to 22 carbon atoms or an aryl or aralkyl group having from 6 to 33 carbon atoms, in the liquid phase over a hydrogenation catalyst, which comprises setting a pH of from 7.0 to 9.0 in the hydrogenation effluent by adding at least one tertiary amine, an inorganic base or an inorganic or organic acid to the hydrogenation feed.Type: ApplicationFiled: February 23, 2007Publication date: March 12, 2009Applicant: BASF SEInventors: Steffen Maas, Thorsten Johann, Michael Koch, Tilman Sirch, Stephan Schlitter, Stefan Rittinger, Michael Steiniger
-
Patent number: 7462747Abstract: The invention relates to a process for preparing polymethylol compounds of the formula (I) where the radicals R are each, independently of one another, a further methylol group or an alkyl group having from 1 to 22 carbon atoms or an aryl or aralkyl group having from 6 to 22 carbon atoms, by condensation of aldehydes having from 2 to 24 carbon atoms with formaldehyde in an aldol reaction using tertiary amines as catalyst to form alkanals of the formula (II) where the radicals R each independently have one of the abovementioned meanings, and subsequent hydrogenation of the latter. The particular inventive feature of this process is that the aldol reaction is carried out using an aqueous formaldehyde solution having a formic acid content of <150 ppm and preferably <100 ppm. In this way of carrying out the process, the formation of by-products can advantageously be prevented in a targeted manner and the yield of the desired polymethylol compound can thereby be increased.Type: GrantFiled: April 30, 2007Date of Patent: December 9, 2008Assignee: BASF AktiengesellschaftInventors: Timan Sirch, Michael Steiniger, Steffen Maas, Stefan Rittinger, Stephan Schlitter, Maria Guixa, Todd C. Spengeman, Jeffrey T. Andress
-
Patent number: 7459571Abstract: Catalyst in the form of an extrudate which comprises from 5 to 85% by weight of copper oxide and in which the same oxidic support material is present in the active composition and as binder, and the use of the catalyst for the hydrogenation of carbonyl compounds.Type: GrantFiled: November 2, 2007Date of Patent: December 2, 2008Assignee: BASF AktiengesellschaftInventors: Stephan Schlitter, Olga Schubert, Michael Hesse, Sabine Borchers, Markus Roesch, Rolf Pinkos, Alexander Weck, Gunther Windecker
-
Patent number: 7456249Abstract: The present invention relates to a solid, acid catalyst for the preparation of polytetrahydrofuran, polytetrahydrofuran copolymers, diesters or monoesters of these polymers by polymerization of tetrahydrofuran in the presence of at least one telogen and/or comonomer, which has a BET surface area of at least 160 m2/g and an acid center density of at least 0.05 mmol/g for pKa values of from 1 to 6, to a process for preparing it and to a process for the polymerization of cyclic ethers over this catalyst.Type: GrantFiled: January 10, 2008Date of Patent: November 25, 2008Assignee: BASF SEInventors: Stephan Schlitter, Martin Haubner, Michael Hesse, Stefan Kaeshammer, Rolf Pinkos, Christoph Sigwart